have you tried numrich arms? they recently changed their website which makes finding little misc stuff like stripper clips a pain in the rear but they generally have stuff like that in stock. it may or may not be current production but will tell you in the description if it is original or not.

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ignore my complete lack of capitalization. I still have no problem correcting your grammar.
I never said half the crap people said I did-Albert Einstein
You can't believe everything you read on the internet-Benjamin Franklin
Bean counters told me I couldn't fire a man for being in a wheelchair, did it anyway. Ramps are expensive.-Cave Johnson.